SKM 2023 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 5: 2D Materials and their Heterostructures III
DS 5.3: Vortrag
Dienstag, 28. März 2023, 10:15–10:30, SCH A 316
Probing magnetic ordering in air stable iron-rich van der Waals minerals — •Muhammad Zubair Khan1, Apoorva Sharma2, Sergio Valencia3, Florian Kronast3, Oleg E. Peil4, Georgeta Salvan2, Christian Teichert1, and Aleksandar Matković1 — 1Institute of Physics, Montanuniversität Leoben, Austria. — 2Institute of Semiconductor Physics, Technische Universität Chemnitz, Germany. — 3Department of Spin and Topology in Quantum Materials, Helmholtz-Zentrum Berlin, Germany. — 4Materials Center Leoben, Austria.
We demonstrate magnetic ordering in Fe-rich two-dimensional (2D) phyllosilicates: annite, minnesotaite, and biotite. These van der Waals (vdW) minerals, incorporate local moment baring iron (Fe) ions via magnesium (Mg) substitution. The phyllosilicate capping silicate/aluminate tetrahedral groups make monolayers air stable. Superconducting quantum interference device vibrating sample magnetometry (SQUID-VSM) was used probe long-range magnetic ordering in bulk. In-field magnetic force microscopy (MFM) confirmed the local magnetic moment at room temperature, present down to monolayers. X-ray photoelectron spectroscopy (XPS) were used to observe the Fe oxidation state and to establish a correlation with magnetic ordering. Further, magnetic ordering in thin flakes was probed via X-ray magnetic circular dichroism. Our study of Fe-baring vdW minerals may drive the development for controllable synthesis of novel 2D magnetic insulators.